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Thalassobaculum litoreum gen. nov., sp. nov., a member of the family Rhodospirillaceae isolated from coastal seawater

School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-742, Republic of Korea

Correspondence
Byung Cheol Cho
bccho{at}snu.ac.kr

A Gram-negative, facultatively anaerobic strain with slightly curved and straight rod-shaped cells, strain CL-GR58^T, was isolated from coastal seawater (near Gori, Korea). Analyses of the 16S rRNA gene sequence revealed that strain CL-GR58^T belonged to the family Rhodospirillaceae with Azospirillum lipoferum as its closest relative (gene sequence similarity of 90.9 %). Phylogenetic analyses of the 16S rRNA gene sequences showed that strain CL-GR58^T was not associated with any known genera in the family Rhodospirillaceae. The novel strain grew in the presence of 1–10 % sea salts, optimally at 30–35 °C and pH 8. The major cellular fatty acids consisted of C_{18 : 1}7c (48.5 %), C_{16 : 0} (14.8 %), C_{17 : 0} (12.2 %), C_{19 : 0} cyclo 8c (6.3 %) and summed feature 3 (C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH, 6.0 %). Among the phylogenetically related genera, the fatty acid C_{17 : 0} was found only in strain CL-GR58^T. The DNA G+C content of the novel strain was 68.0 mol%. According to phylogenetic analyses of the 16S rRNA gene sequence, fatty acid content and the physiological data, strain CL-GR58^T represents a novel species in a new genus of the family Rhodospirillaceae, for which the name Thalassobaculum litoreum gen. nov., sp. nov. is proposed. The type strain of the type species is CL-GR58^T (=KCCM 42674^T=DSM 18839^T).

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